Re: Custom Guitar Advice - Ibanez AT100 Style
As regards the bridge, get a VS401. Its basically a VS100, the difference is the trem bar drops into the end of the bridge block, and the tension is adjusted by a grub screw from the rear. Its the best trem bar I've ever seen. Bridge wise, its got nice, modern saddles that lock down properly, and its a 2 post rather than 6 screw (or 4 screw) mounting. Much more stable tuning when using the bar this way.
2 - The combo you've listed should give a great sound, with plenty of bite. It'll be sharper than mahogany (which can be really muddy), without being overly brittle.
3 - The treble bleed mod actually exists on most ibanez models. All it means is that unlike most gutiars, where rolling down the volume also darkens the tone, the circuit is modified so that the volume changes without affecting the tone. Personally, I actually prefer guitars without it. I find that I use the volume mostly for either swells, where the darker start sounds good, or for cleaning up, where, once again, a darker sound usually sounds sweeter.
4 - I'd recommend a bone nut or bone substitute. Graphite nuts are very soft, so they wear fast and don't offer the greatest sustain on open notes. With a straight string pull at the headstock, the tuning should remain as stable as anyone would ever need. The harder material will help you achieve an even tone across the neck. Or you could try brass, which would be quite bright but, being metal, would mean your tone would be about the same between nut and frets.
5 - I've found that the most comfortable all around neck profile is actually about 21mm at the nut and 22 or so at the body, with a softened "C" carve. The flat backs on ibanez necks irritate me and don't either fill the hand or offer support. Get Ernie to show you some necks built to more traditional measurements. Over time I've found them much better than super thin necks, and I own a super wizard, so this isn't a one time comparison.
Radius wise, I think my favourite radius is anywhere between 12 and 14. People will tell you flatter is better, in my experience thats just not true, its only a concern for people who are, frankly, far too much of a goddamned ***** to learn to play with slightly thicker strings and a slightly higher action. I moved from 9's on flat necks to 11's on rounder, 12" or so necks, and I've never looked back. If i'd stuck with 9 guage strings I'd choke out and my action would be too high, but with the thicker strings its just perfect and gives the guitars an awesome meaty feel, you can really dig in and feel the music instead of playing like a robot.
You'll also find a meatier neck offers some really awesome tonal benefits and will soften that clinky clanky attack some thinner necks have.